COMPUTATIONAL FLUID DYNAMICS USING COMMERCIAL CFD CODES
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1 ME469B - Spring 2007 COMPUTATIONAL FLUID DYNAMICS USING COMMERCIAL CFD CODES Gianluca Iaccarino Dept. Mechanical Engineering Bldg. 500 RM 204 (RM500-I) Ph jops@stanford.edu ME469B/1/GI 1
2 ME469B - Topics Introduction to CFD Analysis and CFD Codes Geometry Modeling and (Unstructured) Grid Generation Solution Algorithms for Incompressible/Compressible Flows (Steady/Unsteady, Flow Adaptivity, Moving Meshes, etc.) Advanced Physical Models (Turbulence, Multiphase Flows, Heat Transfer, etc.) User Programming and Automation ME469B/1/GI 2
3 ME469B - Outline Theoretical Background: 50% Applications and Examples: 50% Lectures: Regular lectures Tutorials/Lab (keep friday free) Final Project Software is accessible on the Stanford Network Several Windows Workstations are Available ME469B/1/GI 3
4 ME469B - Grades No Formal Final Exam at the End of the Quarter Grade is: 60% Final Project 40% Homeworks Additional exercises are optional! ME469B/1/GI 4
5 ME469B - Final Project The final project is a complete CFD project from problem statement to discussion of results Proposals for projects are welcome let s discuss them in due time. Lectures end early to leave enough time for the final project do not start at the last minute! ME469B/1/GI 5
6 ME469B - General Information Class WEB site: Announcements Lecture Notes Homeworks and Exercises Examples Additional References Software User Manuals ME469B/1/GI 6
7 In ME469A: Grid generation Basic information Numerical Methods Theoretical background Analysis of discretization schemes Implicit/explicit solvers Convergence acceleration techniques (i.e. multigrid) Methods for Navier-Stokes equations Simple codes for specific problems Burgers equations Advection/diffusion problem ME469B/1/GI 7
8 In ME469B: Grid generation Background information Emphasis on unstructured-mesh techniques Numerical Methods Background information Discretization accuracy Efficiency and Acceleration techniques Commercial general-purpose CFD packages Complex problems Real-world engineering tools ME469B/1/GI 8
9 In ME469B (cont d): Advanced CFD Techniques Grid adaptivity Moving Meshes & Coordinate systems Advanced Physical Models Turbulence Models Multiphase Flow Models Heat Transfer Credibility of CFD solutions Validation: Are we solving the correct equations? Verification: Are we solving the equations correctly? Sensitivity analysis ME469B/1/GI 9
10 Requirements: Basic Fluid Dynamics Laminar/Turbulent Flows Compressible/Incompressible Fluids Navier-Stokes equations Heat transfer Numerical Methods Upwind/Central/ discretizations Implicit/Explicit schemes Convergence/Stability/Accuracy Software Basic Unix/Linux Basic Networking Basic of C Programming ME469B/1/GI 10
11 A Typical CFD Project Real World The intended application Conceptual Model Physical laws, hypothesis and models (e.g. a set of PDEs) and initial and boundary conditions Computer Model A set of computational algorithms that allow to build a numerical, approximated solution to the conceptual model ME469B/1/GI 11
12 Real World A Typical CFD Project Qualification Conceptual Model Computer Model Qualification: Determination of the adequacy of the conceptual model to provide acceptable level of agreement for the intended applications ME469B/1/GI 12
13 A Typical CFD Project Real World Conceptual Model Computer Model Verification Computer codes Numerical solutions Verification: Process of determining that (1) the model implementation accurately represents the conceptual model and (2) the solution to the model is accurate ME469B/1/GI 13
14 A Typical CFD Project Real World Validation Conceptual Model Computer Model Validation: Process of determining the degree to which the model is an accurate representation of reality from the perspective of the intended application ME469B/1/GI 14
15 A Typical CFD Project Formulate the basic assumptions Compressible/Incompressible fluid (Mach number) Viscous/Inviscid Flow (Reynolds Number) Define the physical and computational problem Geometry definition Grid generation Boundary condition set-up Choose a solution strategy Space/Time Discretization scheme Set-up Simulation Monitors Analyze the results Evaluate convergence Evaluate grid dependence Postprocess data of interest ME469B/1/GI 15
16 Flow in a Jet Engine Combustor Pratt & Whitney PW6000 ME469B/1/GI 16
17 CFD of the flow in a Jet Engine Complex Geometry Full geometry consists of 18 injectors Intricate passages Large scale overall but several crucial small components Complex Physics Turbulent, highly unsteady flow Multiphase (air/liquid fuel) Reacting flow Pollutants & Particulate Heat transfer, radiation Large scale calculation Order 100 million grid cells Run on largest computer in US (>1000s Nat. Lab.) ME469B/1/GI 17
18 Geometry Definition Both the interior and exterior of the Fuel Injector are modeled ME469B/1/GI 18
19 Grid Generation It requires from few days to several months. ME469B/1/GI 19
20 Flow Solution Typically it consists of an iterative procedure it might require several thousand CPU hours of a dedicated supercomputers!!! ME469B/1/GI 20
21 Stanford ASCI Team ME469B/1/GI 21 Animation by J. Schluter
22 Analysis of the Results Flow Features in Cross Sections of the Combustor ME469B/1/GI 22
23 Bubble Dynamics and Cavitation Multiphase, unsteady flow ME469B/1/GI 23
24 Environmental Dispersion Multispecies, unsteady flow ME469B/1/GI 24
25 Heat Exchangers Flow and heat transfer ME469B/1/GI 25
26 Fluid/Structure Interactions ME469B/1/GI 26
27 Software Tools SolidWorks Cubit CFX Tecplot ProE ICEM Phoenix Ensight AutoCAD GridPro StarCD FieldView Gambit Fluent Geometry Modeler Grid Generator Flow Solver Flow Analysis PreProcessing Post Processing ME469B/1/GI 27
28 Software Tools Several Codes with similar capabilities are in the market FLUENT/GAMBIT are available Use of other codes is welcome (CFX. StarCD, CFDRC have been used in the past) ME469B/1/GI 28
29 Software Tools Other codes available at ME Stanford StarCD CFX PowerFlow Main differences will be outlined Results obtained with different codes will be presented Software access is limited to FLUENT and GAMBIT to facilitate exchange of examples and tutorials ME469B/1/GI 29
30 Introduction to CFD Commercial Codes Grid generation: Gambit GUI based Geometry definition CAD geometry import (IGES, STL, etc.) Structured & unstructured meshes Viscous layers clustering Export grids in various format Journal files for automation Grid Quality Metric measures Mesh improvement and smoothing ME469B/1/GI 30
31 GAMBIT GUI Snapshot ME469B/1/GI 31
32 GAMBIT gambit -id <namefile> Interactive execution with GUI gambit -inp <journalfile> Batch execution without GUI Geometry & Grid are saved in a database file (*.dbs) The mesh is saved into a solver-dependent file (*.msh) ME469B/1/GI 32
33 Introduction to CFD Commercial Codes Solver: Fluent GUI based Widely used Several features (physical & numerical models) User-Defined programming Postprocessing capabilities Export results in various format Journal files for automation Grid adaptation Mesh refinement schemes Adaptation functions ME469B/1/GI 33
34 FLUENT GUI & Graphic Window ME469B/1/GI 34
35 FLUENT fluent 3d Interactive execution with GUI fluent 3d -g -i <journalfile> Batch execution without GUI Case set-up and boundary conditions are saved in a case file (*.cas) The solution is saved in a data file (*.dat) Selected data can be exported into other formats ME469B/1/GI 35
36 Software/Computer Access Accounts are available on the PCs in Bldg 500-RM 500N2 Fluent and Gambit are pre-installed and ready to go Please contact Steve Jones if you have already access to computational resources and want to use Fluent (mention that you are taking ME469B) For anything else contact me directly: ME469B/1/GI 36
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